First write `hello, world`{{}} into `/tmp/a.txt`{{}} :

`echo "hello, world" > /tmp/a.txt`{{execute T2}}

Use [`cat`{{}} command](https://arthas.aliyun.com/en/doc/cat.html) to concatenate and print files, which is pretty much alike in linux.

`cat /tmp/a.txt`{{execute T2}}

Then you can see that `hello, world`{{}} has been printed out.